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Years after a devastating war between humans and monsters, a child has fallen through a hole and into the monsters' underground world. Under the care of a kindly monster woman named Toriel, they learn the basics of the underground world, including that they may be attacked by other monsters who are less friendly. After the child leave's Toriel's care, it's up to them how they proceed through the underground, including whether they kill the monsters in their way or try to find peaceful resolutions to conflict.

Undertale is an Eastern RPG with some action aspects in its combat system. In the overworld, the player explores areas, solves puzzles, and talks to NPCs. When a battle is triggered, typically through random encounter, the game switches to the combat screen. A heart representing the child's soul appears in a small box, in which objects representing the monsters' attacks appear and must be dodged in real time. On the child's turn, they can attack monsters more directly through the fight command. A meter that determines the strength of the player's attack must be hit with good timing in order to deal more damage.

Alternatively, players may choose to perform friendly actions in battle or show mercy to the opponent in order to resolve conflict without bloodshed. It is possible to finish every encounter in the game without killing anyone, though some monsters are more difficult to do this with than others. The player may need to perform certain actions in the overworld before some monsters can be befriended.

Although only one Undertale save file can be kept at a time, the game remembers certain player actions across playthroughs, mainly in reference to how violent or peaceful they were. Resetting to an earlier save or starting a new game after specific actions are taken can affect how some NPCs treat the player and how the story is ultimately resolved.


Undertale Windows Not really sure why this black eye came up, but hey, it's there.
Undertale Windows This flying bit added some interesting 'new mechanics' to the game... (not really, it was just fun).
Undertale Windows How lewd. Probably waiting for the hot babes to show up.
Undertale Windows The first item shop is a bake sale run by some enterprising arachnids. All proceeds go towards helping real spiders!

Promo Images

Undertale Screenshot
Undertale Screenshot
Undertale Other
Undertale Other Posted on July 10, 2013 to commemorate the project hitting the $32,500 stretch goal.

Part of the Following Groups

User Reviews

You'll laugh, you'll cry, and you might pet some dogs Windows Harmony♡ (20152)

Critic Reviews

TechRaptor Windows Oct 05, 2015 10 out of 10 100
IGN Windows Jan 12, 2016 10 out of 10 100
RPGamer Windows Oct, 2015 5 out of 5 100
GamingTrend Windows Sep 30, 2015 100 out of 100 100
Vandal Online Windows Oct 03, 2015 9.8 out of 10 98
RPGFan Windows Oct 04, 2015 95 out of 100 95 Windows Jan 02, 2016 9 out of 10 90 Windows Oct 07, 2015 87 out of 100 87
New Game Network Windows Sep 28, 2015 87 out of 100 87
Christ Centered Game Reviews Linux Jan 15, 2016 80 out of 100 80


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Reused and Remixed Audio

Some songs and other audio clips in the game originated from other projects that lead developer Toby Fox has worked on. Perhaps most notably, the boss theme "Megalovania" was composed by Fox for an EarthBound ROM hack he made in his teens, and was later remixed for the webcomic Homestuck. Flowey's laughter also originated in the comic, where it was used for the character Caliborn. Lastly, the track "Fallen Down" was composed for I Miss You, a tribute album made using EarthBound's soundfont.

Sans and Papyrus Inspiration

Two of the game's major characters are Sans and Papyrus, a pair of skeletons named after the fonts their dialogue is rendered in. This is reminiscent of the webcomic Helvetica, in which the eponymous protagonist is a skeleton who shares his name with a font. The comic's author, J.N. Wiedle, is indeed listed in the credits as having provided inspiration for the characters.


  • The Dragon Awards – Best Science Fiction or Fantasy PC/Console Game (2016):
    • Nominated

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Contributed to by リカルド・フィリペ (128984), Harmony♡ (20152) and Sciere (505776)